void set_element_event_cb(desktop_element *element);
gboolean element_button_event_cb(GtkWidget *widget, GdkEventButton *event, gpointer ptr);
gboolean element_key_press_cb(GtkWidget *widget, GdkEventKey *event, gpointer ptr);
gboolean element_key_release_cb(GtkWidget *widget, GdkEventKey *event, gpointer ptr);
gboolean element_mouse_crossing_cb(GtkWidget *widget, GdkEventCrossing *event, gpointer ptr);
gboolean element_mouse_move_cb(GtkWidget *widget, GdkEventMotion *event, gpointer ptr);
